Up to 20% Off AR-15 Uppers & Accessories | Shop Now

Up to 20% Off AR-15 Uppers & Accessories | Shop Now

AT3 Tactical 5.56 NATO AR-15 Parts

5.56 AR-15 parts by AT3 Tactical, from BCGs to muzzle devices, and any AR part your rifle needs in between.

Showing 1–24 of 66 results

List

Grid

Filter

Sort

LIST

Sale!

AT3™ Complete Rifle AR-15 Upper - .223/5.56 16" Ballistic Advantage Barrel - With Nickel Boron BCG and Mil-Spec CH

(1)

AT3™ .223/5.56 16″ Complete Assembled AR-15 Upper – With Nickel Boron BCG and Charging Handle

Sale!

AT3 Complete .223 Wylde Match Grade Upper Faxon Heavy Fluted Barrel

(4)

AT3™ Assembled Match Grade AR-15 Upper – .223 Wylde 16 Inch Faxon Firearms Barrel – No BCG/CH

Sale!

AT3 Tactical 16 Inch 5.56 NATO Lightweight Complete AR-15 Upper Assembly - No BCG or Charging Handle

(10)

AT3™ Assembled AR-15 Upper – .223/5.56 16″ Ballistic Advantage Barrel – No BCG/CH

Sale!

AT3 Tactical Billet Upper and Pro Quad Rail AR-15 Handguard Combo with Cerakote Finishes

(19)

AT3™ AR-15 Upper Receiver and Pro Quad Rail Handguard Combo

Sale!

AT3 Spear M-LOK Handguard with Cerakote Finishes - 7 Colors

(726)

AT3™ SPEAR Free Float AR-15 Handguard – 9, 12, & 15 Inch – M-LOK

Sale!

AT3 AR-15 Billet Upper and M-LOK Handguard with Cerakote Finishes - 7 Colors

(164)

AT3™ AR-15 Upper Receiver and SPEAR Handguard Combo

Sale!

2A Basics 5.56 NATO .223 Rem 16 Inch Complete AR-15 Upper Receiver - No BCG or Charging Handle

(2)

AT3™ 5.56 16″ Assembled Upper – 2A Basics ASAL Handguard – No BCG/Charging Handle

Sale!

AT3 Tactical Pro Quad Rail AR-15 Handguard with Cerakote Finishes

(308)

AT3™ Pro Quad Rail Free Float AR-15 Handguard – 7, 9, 12, & 15 Inch – Picatinny

Black Warhammer with BCG

(54)

AT3™ Black Nitride 5.56 Bolt Carrier Group with Breek Arms Warhammer AR-15 Charging Handle

RECOMMENDED

AT3 Tactical AT-15 M-LOK Builder Set - Lower, Upper, and SPEAR M-LOK Handguard

(9)

AT3™ AT-15 M-LOK Builder Set – Anodized and Cerakote

RECOMMENDED

AT3 Tactical AT-15 Quad Rail Builder Set - Lower, Upper, and Pro Quad Rail Handguard

(6)

AT3™ AT-15 Quad Rail Builder Set – Anodized and Cerakote

RECOMMENDED

AT3™ AR-15 Bolt Carrier Group - 5.56 NATO/.300 Blackout - Black Nitride

(195)

AT3™ AR-15 Bolt Carrier Group Black Nitride – .223/5.56 NATO .300 Blackout .350 Legend

AT3™ Mil Spec Buffer Tube Kit For AR-15

(93)

AT3™ Mil Spec Buffer Tube Kit For AR-15 – 9 Colors Available

RECOMMENDED

AT3 Tactical 3-Port Muzzle Brake

(57)

AT3™ AR-15 3-Port Muzzle Brake – 1/2×28 – 5.56 NATO – Crush Washer Included

RECOMMENDED

(17)

AT3™ AR-15 Bolt Carrier Group Nickel Boron – .223/5.56 NATO .300 Blackout .350 Legend

AT3 Tactical Crush Washer - 1/2 Inch for 5.56/.223

(12)

AT3™ 1/2 Inch Crush Washer for .223/5.56 Muzzle Devices Compatible with AR-15

Spare 5.56 Bolt in Black Nitride

(9)

AT3™ AR-15 Replacement Bolt – 5.56 NATO/.300 Blackout – Black Nitride

AT3 Tactical 3-Port Muzzle Brake

(25)

AT3™ AR-15 3-Port Muzzle Brake – 5/8×24 – .300 BLK/.308 Win – Crush Washer Included

Black Upper with BCG

(11)

AT3™ Slick Side AR-15 Upper with Black Nitride 5.56 Bolt Carrier Group

Slick Side Upper with Ambi Charging Handle and Bolt Carrier Group

(2)

AT3™ Slick Side Upper with Bolt Carrier Group and Breek Arms Warhammer Charging Handle

NEW

AT3 Barrel Builder Kit – 16″ 5.56 NATO Government Profile Mid-Length Barrel, Gas Block & Gas Tube

AT3 Tactical Rifle Kit with Lightweight Barrel FDE

(7)

AT3 Tactical 16″ 5.56 NATO Pencil Barrel AR-15 JNL Ready Build Kit – M-LOK / Magpul CTR

AT3™ AR-15 A2 Mil-Spec Flash Hider with Crush Washer

(31)

AT3™ AR-15 A2 Mil-Spec Flash Hider – 1/2×28 – 5.56 NATO – Crush Washer Included

NEW

AT3 Barrel Builder Kit – 16″ 5.56 NATO Government Profile Mid-Length Barrel, Gas Block, Gas Tube & BCG